was about to say that's not cheap at all . for that many miners to be safe he would need a building out side his home or i would, one with 3 240 lines at 50 amps or better and at least two 120 lines for external add ons to plug in stuff to be safe, would even need a business account in my state for that much power usage per month which is cheaper then homes get here. I'm at 8.55 cents per KWH to me that's to much compared to some in US at 4 cents per kwh .Id kill for that if i could get it and not move to Washington state.
SO to the OP bear in mind if you plan to run that many in your home there is a lot more involved then just plugging that many miners in your home .if that's the plan, but then there that's poss of blocks being hit sooner and faster with that much hash pumping out all the time
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difficulty in 6.5 days: 48882648479.1 or less so not to bad but still the power cost would be a nite mare for me .